Abstract
Three structural elements of the East Greenland Caledonides are present in Hertugen af Orleans Land: (1) a marginal NNE-SSW trending zone of crystalIine basement rocks overlain by middle Proterozoic sediments (Trekant Series) in the westernmost nunatak area, characterised by folds and thrusts; (2) a central NNE–SSW trending belt of alIochthonous orthogneisses dominated by upright and west-vergent folds; and (3) and eastern N–S trending sinistral shear zone of intensely sheared, mylonitic gneisses (Storstrømmen shear zone). This structural pattern is a continuation of the structural elements in Dronning Louise Land, 40 km to the south-south-east. The late Caledonian Storstrømmen shear zone and its northward continuation define a 10 km wide linear feature of regional significance which can be followed along strike for more than 300 km.
Highlights
Three structural elements of the East Greenland Caledonides are present in Hertugen af Orleans Land: (1) a marginal NNE-SSW trending zone of crystalIine basement rocks overlain by middle Proterozoic sediments (Trekant Series) in the westernmost nunatak area, characterised by folds and thrusts; (2) a central NNE-SSW trending belt of alIochthonous orthogneisses dominated by upright and west-vergent folds; and (3) and eastern N-S trending sinistral shear zone of intensely sheared, mylonitic gneisses (Storstrømmen shear zone)
Hertugen af Orleans Land is a region of dispersed nunataks which extends from 77° 30' to 78° 40' in North-East Greenland (Fig. 1)
The only published map is that of Haller (1983) who indicated that Hertugen af Orleans Land is largely underlain by basement gneisses which to the west are involved in the marginal thrust and fold belt which defines the western limit of the East Greenland Caledonides
Summary
It is only possibIe to provide a generalised description of the geology because of the reconnaissance nature of the mapping. The marginal thrust and fold belt is thought to be structurally equivalent to parts of the Western Foreland and Imbricate Zone of Dronning Louise Land (Friderichsen et al, 1990). It comprises schists and gneisses which are inferred to represent basement to a metasedimentary sequence correlated with the Trekant Series of Dronning Louise Land (Peacock, 1956a,b, 1958; Haller, 1983; Friderichsen et al, 1990). The rocks of this complex are well exposed on parts of Bildsøe Nunatakker and Laub Nu-
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